Time constant = τ = L/R
Time constant τ is the time it takes for an inductor in series with resistor to get to 63% of full current. Equivalent to a train running at 63% of full speed.
Trains take time to have their speed increased because they have mass.
Inductors take time to have the current trough them increased because they have inductance.
See also Harry Olson (RCA) acoustic, mechanical, electrical analogies.
See also The Feynman Lectures on Physics - Feynman, Leygton, Sands
See also Introduction to System Dynamics - Searer, Murphy, Richardson
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